Gas gun



y 935. a, P. Mc MANAMNA ET AL 2,001,207

GAS GUN Filed Nov. 25, 1935 Ill/Ill ATTORNEY Patented May 14,

UNITED STATES GAS GUN Gerald P. McManamna and Kurt F. J. Kirsten,

Seattle, Wash.

Application November 25, 1933, Serial No. 699,888

2 Claims.

This invention relates to .improvements in what are known in trade as gas guns" and which are of that character for forcibly discharging a stream, or spray of finely divided material from 5 the device; it being the principal object oi this invention to provide a device of the above character especially useful as a fire extinguishing means and comprising a container from which the fire extinguishing material is fed to the container outlet and forcibly ejected by reason of expansion of gas confined under pressure therein.

More specifically stated, the objects of this invention reside in the provision 01' a device of the character above stated comprising an air tight material container having a valve controlled delivery nozzle at one end, and which container is divided interiorly by a floating or movable parti-- tion, into separate compartments for the gas and material respectively and which partition, incident to opening or the nozzle valve, will be moved by pressure of gas in the other compartment to iced the material to the nomle in accordance with its rate of ejection with the escaping gas.

Other objects of the invention reside in the their combination and mode of operation as will hereaiter be fully described.

In accomplishing these, and other objects of the invention, I have provided the improved details at construction, the preferred forms of which are illustrated in the accompanying drawing, wherein-- I Fig. l is a central, longitudinal section of a gas gun embodying the present invention.

Fig. 2 is a cross section of the same as on line t-i in Fig. i. V

Fig. 3 is an enlarged sectional detail of a part of the imperiorate floating partition.

Reierring more in detail to the drawingso i designates what may be a cylindrical container, or bottle, of suitable material, preferably metal, capable of withstanding the internal pressure of gas to which it is subjected in use. At one end the container terminates in a spout 2 onto which a discharge nozzle 3 is threaded. Associated with the nozzle is a valve t for controlling the delivery of material and this valve is opened and closed by a hand lever 5. Slidably fitted in the cylinder is a partition wall 6 dividing the cylinder into opposite end compartments; the 'compartment at the nozzle end of the device being designated -as the dust or material compartment. and that at the other end being designated as the gas compartment. Under action of gas pressure at one side, the partition or piston is details of construction of the various parts, in

adapted to be moved to advance the supply of material or dust, designated at I, to the nozzle.

The piston, as herein shown, is provided on one face with legs 8 adapted to engage the end wall of the gas compartment to limit movement 5 of the partition in that direction and to insure a compartment of a definite size for containing the gas under pressure. The piston, as seen in Fig. 3, has perforations 9 formed therein so as to permit the gas to slowly flow or escape through it to balance or tend to balance pressures against opposite sides, of the partition.

For convenience in filling the device with gas, a nipple ill is provided in the end wall opposite the nozzle for attachment of a hose or tube lead-. ing from the gas supp y., Normally this nipple is closed by a plug or cap H, as shown.

In filling the device the nozzle is removed and the partition wall adjusted to a position against the opposite end of the container. Then the dust compartment is filled and the nozzle replaced. Then the cylinder is charged with gas through nipple it, and the gas held by applying the plug ii. The gas that is thus trapped under pressure permeates the material and forms a body of concentrated gas in the gas compartment.

In using the device, the nozzle valve t would be opened to any extent desired, and this will permit an outflow of gas which carries with it a stream, or spray of thematerial l. Reduction of the gas pressure at that end of the container permits the greater pressure of gas at the opposite end to shift the piston'or partition toward the nozzle end and thereby to advance the supply of material to the nozzle in accordance with the rate at which it is used. The gas escaping from the gas chamber through the perforations of the piston, then through the supply of material and finally through the nozzle carries with it the divided material. Thus the feeding of material is automatic and under direct control of the nozzle valve.

Devices of this character may be made in various sizes and proportions, and of various materials to meet various requirements, and therefore, it is not desired that the claims should be limited to the details or proportions shown, but shall be given an interpretation commensurate with the scope of the invention disclosed.

Such devices are useful for various purposes but the present design is especially useful for fire extinguishing purposes.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is- 1. A device oi the character described comprising a closed container having an outlet and a closure means therefor, a floating partition dividdivided material and movable under pressure of the expandable medium toward the outlet to advance material in the material compartment thereto; said partition being constructed and arranged so as to establish restricted communication between said compartments so that some of said medium will enter the material compartment to aid in expelling the material from the outlet.

2. A device of the character described comprising a closed container having an outlet and a closure means therefor, a floating partition dividing the container into two separate compartments. respectively, for containing a concentrated supply of expandable pressure medium and a divided material and movable under pressure of the expandable medium toward the outlet to advance material in-the material compartment thereto; said partition having perforations therethrough constructed to cause restricted leakage of pressure medium into the material comp'artmerit for escape through the outlet as a carrier for the material.

GERALD P. MCMANAMNA. KURT F. J. KIRSTEN. 

